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Strictly speaking, you’re not signing a contract with Topmate for delivery. So, it doesn’t come under the gambit of moonlighting.
When you’re freelancing, there is almost always a contract, which most companies might consider moonlighting.
But if you read your company policy, they can easily twist it against you and say Topmate is moonlighting! The wording is intentionally vague :D

Is income from Topmate considered as income from business?

It’s just Income from Other Sources I think. You can also show it under 44ADA as a freelance income.
But someone more knowledgeable should be able to help.
For TopMate you aren't building things for a company which may be your current employer's competitor.
Also the time required is lesser and can be managed by a person having full time job, while a part-time/freelancing opportunity comes with the possibility of a person prioritising that over their current full time job.
That's why companies are okay with it.

Agree, makes sense

I hope PF/UAN is not involved anywhere here.
